Dr. Robert Tarzwell, a North Vancouver scientist out of Lions Gate Hospital, is among a team of scholars who have made Discover Magazine‘s top 100 stories of 2015 list, coming in at number 19.

Dr. Tarzwell was one of the scientists led by Dr. Daniel Amen who published a study in July that discovered how a medical imaging test could tell the difference in the brain between post-traumatic stress and traumatic brain injuries.

“Over a million soldiers have served in the wars in Iraq and Afghanistan. Of the men and women who have returned from combat, more than 100,000 have been diagnosed with posttraumatic stress disorder (PTSD). Over 300,000 more have been told they have a traumatic brain injury (TBI). In many cases, symptoms are the same: insomnia, anxiety, irritability, poor concentration and limited impulse control,” said Discover Magazine.